WO2021017950A1 - Procédé et appareil de traitement par ultrasons, dispositif électronique et support lisible par ordinateur - Google Patents

Procédé et appareil de traitement par ultrasons, dispositif électronique et support lisible par ordinateur Download PDF

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Publication number
WO2021017950A1
WO2021017950A1 PCT/CN2020/103323 CN2020103323W WO2021017950A1 WO 2021017950 A1 WO2021017950 A1 WO 2021017950A1 CN 2020103323 W CN2020103323 W CN 2020103323W WO 2021017950 A1 WO2021017950 A1 WO 2021017950A1
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ultrasonic
frequency
electronic device
amplitude
data
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PCT/CN2020/103323
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English (en)
Chinese (zh)
Inventor
严锋贵
潘朝
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Oppo广东移动通信有限公司
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Publication of WO2021017950A1 publication Critical patent/WO2021017950A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/521—Constructional features
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/523—Details of pulse systems
    • G01S7/526—Receivers
    • G01S7/527—Extracting wanted echo signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/534—Details of non-pulse systems
    • G01S7/536—Extracting wanted echo signals

Definitions

  • This application relates to the technical field of mobile terminals, and more specifically, to an ultrasonic processing method, device, electronic equipment, and computer-readable medium.
  • This application proposes an ultrasonic processing method, device, electronic equipment and computer readable medium to improve the above-mentioned defects.
  • the embodiments of the present application provide an ultrasonic processing method applied to electronic equipment.
  • the electronic equipment includes an ultrasonic transmitting device and an ultrasonic receiving device.
  • the method includes: transmitting an ultrasonic signal through the ultrasonic transmitting device, and Receive the ultrasonic signal returned by the ultrasonic signal after encountering an object through the ultrasonic receiver; obtain the ultrasonic signal received by the ultrasonic receiver to obtain the first amplitude frequency data of the ultrasonic signal; according to the ultrasonic analysis model Parameters, map the first amplitude-frequency data to second amplitude-frequency data; use the second amplitude-frequency data as the input of the ultrasonic analysis model to obtain the motion state of the electronic device; according to the motion state Control the electronic device to perform corresponding operations.
  • the embodiments of the present application also provide an ultrasonic processing, which is applied to an electronic device, the electronic device includes an ultrasonic transmitting device and an ultrasonic receiving device, and the ultrasonic processing device includes: a receiving unit, an acquiring unit, a mapping unit, Detection unit and processing unit.
  • the receiving unit is configured to send an ultrasonic signal through the ultrasonic transmitter, and receive an ultrasonic signal returned by the ultrasonic signal after encountering an object through the ultrasonic receiver.
  • the acquiring unit is configured to acquire the ultrasonic signal received by the ultrasonic receiving device to obtain the first amplitude frequency data of the ultrasonic signal.
  • the mapping unit is configured to map the first amplitude-frequency data to the second amplitude-frequency data according to the parameters of the ultrasonic analysis model.
  • the detection unit is configured to use the second amplitude-frequency data as the input of the ultrasonic analysis model to obtain the motion state of the electronic device.
  • the processing unit is configured to control the electronic device to perform corresponding operations according to the motion state.
  • an embodiment of the present application also provides an electronic device, including: one or more processors; a memory; an ultrasonic transmitting device and an ultrasonic receiving device; one or more application programs, wherein the one or more applications The program is stored in the memory and is configured to be executed by the one or more processors, and the one or more programs are configured to execute the above method.
  • an embodiment of the present application also provides a computer-readable medium having program code executable by a processor, and the program code causes the processor to execute the foregoing method.
  • the ultrasonic signal is sent through the ultrasonic transmitter, and the ultrasonic signal returned by the ultrasonic signal after encountering an object is received by the ultrasonic receiver, and then the ultrasonic signal received by the electronic device is acquired.
  • the motion state of the electronic device is not obtained through the amplitude-frequency data.
  • the first amplitude-frequency data is mapped to the second amplitude-frequency data according to the parameters of the ultrasonic analysis model, and then the Analyze the model and use the second amplitude-frequency data as input to determine the motion state of the electronic device.
  • the electronic device uniformly uses the ultrasonic analysis model and the mapped second amplitude-frequency data to determine the motion state of the electronic device, even if the hardware of the electronic device Different facilities result in different parameters for collecting ultrasonic signals. Due to the use of a unified ultrasonic analysis model and a unified mapping relationship, the difference in ultrasonic analysis effects of different equipment can be reduced.
  • Fig. 1 shows a schematic diagram of a propagation path of ultrasonic waves provided by an embodiment of the present application
  • FIG. 2 shows a schematic diagram of an ultrasonic wave sending, receiving, and data processing flow provided by an embodiment of the present application
  • FIG. 3 shows a method flowchart of an ultrasonic processing method provided by an embodiment of the present application
  • FIG. 4 shows a schematic diagram of the Doppler effect provided by an embodiment of the present application
  • FIG. 5 shows a frequency spectrum diagram of audio data provided by an embodiment of the present application
  • FIG. 6 shows a schematic diagram of the change rule of doppler_dif of the shelter and the mobile terminal in the process of being relatively close, stationary, and far away provided by an embodiment of the present application
  • FIG. 7 shows a method flowchart of an ultrasonic processing method provided by another embodiment of the present application.
  • FIG. 8 shows a flowchart of the method of step S730 in FIG. 7;
  • FIG. 9 shows a flowchart of the method of step S740 in FIG. 7;
  • FIG. 10 shows a schematic diagram of mapping from amp_b_calib to amp_a provided by an embodiment of the present application
  • FIG. 11 shows a schematic diagram of a fitted amplitude-frequency curve provided by an embodiment of the present application.
  • FIG. 12 shows a block diagram of an ultrasonic processing device provided by an embodiment of the present application.
  • FIG. 13 shows a module block diagram of the mapping unit 1230 in FIG. 12;
  • FIG. 14 shows a block diagram of an electronic device used to execute the ultrasonic processing method according to the embodiment of the present application
  • Fig. 15 shows a storage unit for storing or carrying program codes for implementing the ultrasonic processing method according to the embodiment of the present application.
  • the mobile terminal transmits ultrasonic waves through the ultrasonic transmitter (such as earpieces, speakers, special ultrasonic transmitters, etc.). Part of the ultrasonic waves travels through the air directly to the ultrasonic receiver (pickup) (path 1 in Figure 1), and part of the ultrasonic waves travels through the air. The obstruction forms a reflection before reaching the ultrasonic receiver (path 2 in Figure 1).
  • the ultrasonic transmitter such as earpieces, speakers, special ultrasonic transmitters, etc.
  • the ultrasonic receiving device picks up is the superimposed signal of the direct sound and the reflected sound, as shown in Figure 2, which is converted into an audio signal by an A/D converter.
  • the audio data is processed by the algorithm to obtain the operating state of the obstruction relative to the mobile terminal, and then guide the display screen of the mobile terminal to be in the on-screen state or the off-screen state.
  • a fixed-frequency ultrasonic signal can be sent through the built-in ultrasonic transmitter of the mobile terminal. It can be understood that part of the ultrasonic signal sent by the ultrasonic transmitter travels through the air and reaches the ultrasonic receiver. The other part of the device is transmitted through the air and reflected by the obstruction before reaching the ultrasonic receiving device.
  • the ultrasonic receiving device picks up the superimposed signal of the direct sound and the reflected sound, which is converted into an audio signal through A/D.
  • the obstruction can Including human face, human body, etc.
  • a fixed-frequency ultrasonic signal is sent through the built-in earpiece, horn or special ultrasonic transmitter of the mobile terminal.
  • a part of the ultrasonic signal is transmitted through the air directly to the pickup, and the other part is transmitted through the air and reflected by the obstruction.
  • the pickup is the superimposed signal of the direct sound and the reflected sound, which is converted into an audio signal by A/D.
  • the mobile terminal is selected in the ultrasonic frequency range.
  • the frequency with a higher frequency response is used as the ultrasonic transmission frequency.
  • the advantage of this is that the signal-to-noise ratio of the ultrasonic signal picked up by the pickup is higher, which is more conducive to the algorithm's output of correct judgment results.
  • Another factor that affects the choice of ultrasonic transmission frequency is that there will be interference noise in the ultrasonic frequency band inside the mobile terminal. For example, when sensors such as gyroscopes and acceleration sensors are working, they will emit noise in the ultrasonic frequency band of about 21KHz. Therefore, when choosing the ultrasonic transmission frequency Try to avoid these interference noise frequencies.
  • an embodiment of the present application provides an ultrasonic processing method, which is applied to electronic equipment.
  • the electronic equipment includes an ultrasonic transmitting device and an ultrasonic receiving device.
  • the ultrasonic transmitting device may It is its built-in earpiece, speaker or special ultrasonic transmitter, and the ultrasonic receiver can be a pickup.
  • the method includes: S301 to S305.
  • S301 Transmit an ultrasonic signal through the ultrasonic transmitter, and receive an ultrasonic signal returned by the ultrasonic signal after encountering an object through the ultrasonic receiver.
  • the mobile terminal includes both an ultrasonic transmitting device and an ultrasonic receiving device.
  • the ultrasonic transmitting device moves relative to the object, so the ultrasonic receiving device also moves relative to the object.
  • the wavelength of the object radiation changes due to the relative motion of the wave source (mobile terminal) and the observer (object).
  • the Doppler effect formula is as follows:
  • f' is the observed frequency; f is the original emission frequency of the emission source in the medium; v is the propagation speed of the wave in the medium; v 0 is the movement speed of the observer. If it is close to the emission source, the front operation symbol is + number, otherwise it is - number; v s is the speed of movement of the transmission source, if the viewer is close to the front of the operation symbol - number, and vice versa for the + sign.
  • the Doppler effect formula shows that when the emission source is relatively close to the observer, the frequency of the signal received by the observer becomes larger; when the emission source is relatively far away from the observer, the observer receives The signal frequency will become smaller; when the transmitting source and the observer are relatively stationary, the observer receives the same signal frequency as the transmitting source.
  • the electronic device may execute the operation of controlling the ultrasonic transmitting device to send the ultrasonic signal based on the request, and receiving the ultrasonic signal returned by the ultrasonic signal after encountering an object through the ultrasonic receiving device, as an operation
  • the implementation manner may be a trigger request input by the user. For example, an instruction input by a user by operating a physical key of an electronic device or a display interface on an electronic device. Specifically, it may be that the user determines to obtain the request when answering the call.
  • an implementation manner in which the ultrasonic signal is sent through the ultrasonic transmitter device, and the ultrasonic signal returned by the ultrasonic signal after encountering an object through the ultrasonic receiver device may be that when the mobile terminal is in a call state, The ultrasonic signal is sent by the ultrasonic transmitter, and the ultrasonic signal returned by the ultrasonic signal after encountering an object is received by the ultrasonic receiver.
  • the electronic device can monitor the incoming or outgoing call of the electronic device in real time through the built-in monitoring module.
  • the electronic device detects that the electronic device is in the ringing start (CALL_STATE_RINGING) incoming call or dialing operation outgoing call, Whether the electronic device enters the call state is monitored.
  • the electronic device performs a dialing operation, it will send out a system broadcast, and the electronic device can use Broadcast Receiver to monitor.
  • monitoring whether the electronic device is in a call state can be monitoring whether the electronic device is in a call after an incoming call or an outgoing call Interface, where, when it is monitored that the electronic device is in a call (CALL_STATE_OFFHOOK), it can be determined that the electronic device is in a call state.
  • a fixed-frequency ultrasonic signal can be sent through the built-in ultrasonic transmitter of the electronic device. It can be understood that part of the ultrasonic signal sent by the ultrasonic transmitter is transmitted through the air. Directly reach the ultrasonic receiving device, the other part is transmitted through the air and reflected by the obstruction before reaching the ultrasonic receiving device.
  • the ultrasonic receiving device picks up the superimposed signal of direct sound and reflected sound, which is converted into audio signal through A/D.
  • the obstruction may include a human face, a human body, and so on.
  • the ultrasonic signal when the mobile terminal is in a call state, can be sent through the ultrasonic transmitter, and the ultrasonic signal returned after encountering the object through the ultrasonic receiver, or the ultrasonic signal received from the ultrasonic receiver
  • the signal directly sound and reflected sound extracts the ultrasonic signal (reflected sound) returned by the ultrasonic signal after encountering an object, which is not limited here.
  • S302 Obtain the ultrasonic signal received by the ultrasonic receiving device, and obtain the first amplitude frequency data of the ultrasonic signal.
  • the ultrasonic receiving device receives the ultrasonic signal
  • the frequency spectrum of the ultrasonic signal is acquired, and the frequency spectrum is used as the first amplitude frequency data.
  • the abbreviation of frequency spectrum density is the frequency distribution curve.
  • the first amplitude-frequency data may be obtained through discrete Fourier transform, specifically, the audio data collected by the ultrasonic receiving device is obtained, and discrete Fourier transform is performed on the audio data to obtain the audio data. Spectrum data, as the first amplitude frequency data.
  • Discrete Fourier Transform is a discrete Fourier transform in both the time domain and the frequency domain, which transforms the sampling of the time domain signal into the discrete time Fourier transform (DTFT) frequency domain.
  • the frequency spectrum can be obtained by discrete Fourier transform (DFT).
  • DFT discrete Fourier transform
  • Figure 5 shows the audio data spectrogram provided by the embodiments of the present application.
  • the frequency spectrum is the abbreviation of frequency spectrum, which is the frequency distribution curve.
  • the discrete Fourier transform can be used Obtained, in Figure 5, it is a spectrogram obtained by discrete Fourier transform of a piece of audio data. Each point on the abscissa corresponds to a real frequency value, and the ordinate represents the signal strength of the frequency.
  • S303 Map the first amplitude-frequency data to the second amplitude-frequency data according to the parameters of the ultrasonic analysis model.
  • the ultrasonic analysis model may be a preset model for analyzing ultrasonic data.
  • the ultrasonic analysis model may be a machine learning algorithm based on a neural network. The model has been learned in advance based on the amplitude-frequency data of the ultrasonic information and the labels of the corresponding motion state. Obtain the motion state between the device emitting the ultrasonic signal and the object reflecting the ultrasonic signal.
  • the ultrasonic analysis model includes a feature extraction algorithm and a classification model.
  • the ultrasonic analysis model can obtain the motion state corresponding to the amplitude-frequency characteristics of the amplitude-frequency data of the ultrasonic signal. Therefore, if the first amplitude-frequency data is needed as the input of the ultrasonic analysis model, the corresponding motion can be accurately obtained. State, it is necessary to map the first amplitude-frequency data to the amplitude-frequency data that can be used as the input of the ultrasonic analysis model and can obtain the corresponding motion state, that is, the second amplitude-frequency data. That is to say, the second amplitude-frequency data is used as the ultrasonic analysis model, and the motion state can be accurately obtained from the ultrasonic analysis model.
  • the method of mapping the first amplitude-frequency data to the second amplitude-frequency data may be to change the first amplitude-frequency data into the second amplitude-frequency data by a data change method such as weighting or multiplying by certain data.
  • the first amplitude-frequency data is a
  • the second amplitude-frequency data is obtained by adding a constant, that is, a+c.
  • the first amplitude-frequency data may be mapped to the second amplitude-frequency data according to the parameters of the ultrasonic analysis model, which will be specifically introduced in the subsequent embodiments.
  • S304 Use the second amplitude-frequency data as an input of the ultrasonic analysis model to obtain the motion state of the electronic device.
  • the motion state is the relative motion relationship between the electronic equipment and the object. Specifically, the ultrasonic signal emitted by the ultrasonic transmitter of the electronic equipment is reflected by the object and received by the ultrasonic receiver of the electronic equipment.
  • the mobile terminal realizes the recognition of the relative motion state of the obstruction and the mobile terminal through ultrasonic waves, which may include the following methods:
  • the ultrasonic transmitter of the mobile terminal transmits scanning signals in the ultrasonic frequency band at intervals, and the ultrasonic receiver of the mobile terminal receives the reflected and direct ultrasonic signals.
  • the algorithm determines the relative difference between the obstruction and the mobile terminal by comparing the time difference of receiving different ultrasonic signals. Distance, the relative speed can also be calculated through the relative distance, and the relative motion state between the mobile terminal and the obstruction can be further determined according to the relative distance and relative speed.
  • this method has poor anti-interference ability. When there is some ultrasonic noise interference in the environment, the recognition result will produce large errors.
  • the ultrasonic transmitting device of the mobile terminal sends continuous ultrasonic signals.
  • the receiving end determines the phase difference generated by the ultrasonic receiving device after the ultrasonic wave is reflected by calculating the correlation index between the transmitted signal and the received signal.
  • the obstruction and the The relative distance of the mobile terminal, the relative speed can also be calculated through the relative distance, and the relative motion state of the mobile terminal and the obstruction can be further determined according to the relative distance and relative speed.
  • this method has poor anti-interference ability. When there is some ultrasonic noise interference in the environment, the recognition result will produce large errors.
  • the different motion states of the obstruction relative to the mobile terminal can cause the doppler_dif to change regularly.
  • doppler_dif takes a larger positive value; when the obstruction is at a certain speed When the speed is far away from the mobile terminal, doppler_dif takes a small negative value; when the obstruction and the mobile terminal are relatively stationary, doppler_dif takes a value close to 0.
  • the state of motion of the obstruction relative to the mobile terminal can be determined by setting positive and negative thresholds.
  • doppler_dif is greater than threshold1, it is judged as close state; when doppler_dif is smaller than threshold2, it is judged as away state; when doppler_dif is between threshold1 and threshold2, it is judged as normal state.
  • the motion state includes relatively close and relatively far away.
  • the corresponding relationship between the motion state and the operation can be preset.
  • the electronic device may start different applications, and the operation corresponding to the motion state is related to the application. For example, when the user opens the camera application and enters the selfie mode, when it is determined that the front camera of the electronic device is relatively close to the human face, press the shutter button to take a picture. When the faces are relatively far apart, exit the camera application.
  • the ultrasonic processing method is used to control the on and off of the display screen of the electronic device according to the distance between the electronic device and the user's ear when the electronic device is in the call mode, specifically, when the motion state is the electronic device When the device is relatively far away from the object, the display screen is controlled to be in the on-screen state, and when the motion state is that the electronic device is relatively close to the object, the display screen is controlled to be in the off-screen state.
  • the motion state characterizes that the electronic device is relatively close to the object, it characterizes the relative motion relationship between the electronic device and the object as close motion, that is, when the electronic device is in a call state, the electronic device is close to the user's ear, that is, The display screen of the control electronic device is in the off-screen state.
  • the motion state characterizes the relative distance between the electronic device and the object, it characterizes the relative motion relationship between the electronic device and the object as moving away from each other, that is, when the electronic device is in a call state, the electronic device is far away from the user's ears.
  • the display screen of the control electronic device is in a bright screen state.
  • the display screen is controlled to keep the previous state unchanged.
  • the relative static of the electronic device and the object may be that both the electronic device and the object remain stationary, or the electronic device and the object have the same motion state, for example, the electronic device and the object have the same motion speed, same motion amplitude, and motion frequency.
  • the judgment result indicates that the electronic device and the object are relatively stationary, it indicates that the relative motion relationship between the electronic device and the object remains unchanged, and the display screen can be controlled to maintain the previous state unchanged, that is, the electronic device
  • the display is kept in the on-screen state, and when the display is in the off-screen state in the previous state, the display is kept The screen remains unchanged.
  • the algorithm determines that it is the close state, the display screen of the control electronic device is in the off-screen state; when the algorithm determines it is the away state, The display screen of the control electronic device is in a bright screen state; when the algorithm determines that it is a normal state, the screen state of the control electronic device remains unchanged from the previous state.
  • the method provided by the present application sends an ultrasonic signal through the ultrasonic transmitter, and receives the ultrasonic signal returned by the ultrasonic signal after encountering an object through the ultrasonic receiver, and then obtains the ultrasonic signal received by the electronic device.
  • the amplitude-frequency data is used, the motion state of the electronic device is not obtained through the amplitude-frequency data. Instead, the first amplitude-frequency data is mapped to the second amplitude-frequency data according to the parameters of the ultrasonic analysis model. Ultrasonic analysis model, and the second amplitude-frequency data is used as input to determine the motion state of the electronic device.
  • the electronic device uniformly uses the ultrasonic analysis model and the mapped second amplitude-frequency data to determine the motion state of the electronic device.
  • Different hardware facilities result in different parameters for collecting ultrasonic signals. Due to the use of a unified ultrasonic analysis model and a unified mapping relationship, the difference in ultrasonic analysis effects of different devices can be reduced.
  • FIG. 7 shows that an embodiment of the present application provides an ultrasonic processing method applied to the above-mentioned electronic device.
  • the method includes: S710 to S790.
  • S710 Send an ultrasonic signal through the ultrasonic transmitter device, and receive an ultrasonic signal returned by the ultrasonic signal after encountering an object through the ultrasonic receiver device.
  • S720 Obtain the ultrasonic signal received by the ultrasonic receiving device, and obtain the first amplitude frequency data of the ultrasonic signal.
  • S730 Acquire the frequency range of the electronic device according to the maximum recognizable relative speed.
  • the ultrasonic analysis model is obtained by training a standard ultrasonic detection device.
  • the standard ultrasonic detection device may be a pre-set ultrasonic detection device.
  • the ultrasonic analysis model is set in the ultrasonic detection device and is based on the standard ultrasonic detection device.
  • the characteristic parameters of the ultrasonic analysis model are trained on the ultrasonic analysis model, so that the ultrasonic analysis model can be better adapted to the ultrasonic emission frequency of the standard ultrasonic detection device.
  • the ultrasonic analysis model can take into account the interference noise in the standard ultrasonic detection device.
  • Interference noise includes the interference noise in the ultrasonic frequency band inside the above-mentioned equipment.
  • the standard ultrasonic detection device may be another electronic device, that is, an electronic device that has been calibrated.
  • the parameters of the ultrasonic analysis model include the maximum recognizable relative speed of the standard ultrasonic detection device, the reference transmission frequency response at the ultrasonic transmission frequency of the standard ultrasonic detection device, and the like.
  • the standard ultrasonic detection device is terminal A.
  • the terminal A also includes an ultrasonic transmitting device and an ultrasonic receiving device, and may belong to the same category as electronic equipment.
  • both electronic equipment and standard ultrasonic detection devices are Mobile terminal.
  • the ultrasonic transmission frequency of terminal A is f_ultrspnic_a
  • the audio sampling rate is f s .
  • the frequency response of the entire acoustic loop at f_ultrspnic_a is amp_ultrspnic_a
  • the algorithm can
  • the maximum relative motion speed of the identified obstruction is vmax
  • the data length for DFT transformation is fftlen
  • the frequency range considered in the algorithm is [f_low_a,f_up_a]
  • the frequency point data range used in the DFT transformation result is [point_low_a,point_up_a] , A total of n_a frequency points.
  • the parameters of the ultrasonic analysis model include the maximum recognizable relative speed of the standard ultrasonic detection device, and the reference transmission frequency at the ultrasonic transmission frequency of the standard ultrasonic detection device.
  • the data length of the discrete Fourier transform of the standard ultrasonic testing device where amp_ultrspnic_a is the reference transmit frequency response, fftlen represents the data length of the discrete Fourier transform of the standard ultrasonic testing device, and v max is The maximum relative speed that can be identified.
  • step S730 may include S731 to S733.
  • S732 Acquire the frequency range of the electronic device according to the transmission frequency of the ultrasonic sending device and the maximum recognizable relative speed.
  • S733 Determine the frequency range of the electronic device according to the frequency range and the audio sampling rate of the electronic device.
  • the transmitting frequency of the ultrasonic transmitting device is the ultrasonic transmitting frequency f_ultrspnic_b of the ultrasonic transmitting device of the electronic equipment.
  • various ultrasonic parameters of the electronic equipment can be determined and acquired, specifically, including the ultrasonic transmitting frequency f_ultrspnic_b of the ultrasonic transmitting device of the electronic equipment.
  • the audio sampling rate is f s .
  • the maximum relative movement speed of the obstruction that can be recognized by the terminal B is still v max
  • the data length for DFT transformation is also fftlen.
  • the frequency range of the electronic device is the range considered when the electronic device receives the ultrasonic signal, that is, the signal within the frequency range can be received by the ultrasonic receiving device of the electronic device.
  • the frequency range of the electronic device is the frequency range considered when the electronic device processes the ultrasonic signal
  • the frequency range of the electronic device is the frequency range considered when the electronic device processes the ultrasonic signal.
  • the frequency range can be determined according to the above formula (1).
  • the algorithm takes the Doppler effect as one of the objects of feature extraction
  • the frequency range and frequency point range that the algorithm of the electronic device should consider can be obtained according to the maximum relative speed that the algorithm can recognize.
  • the frequency range of electronic equipment can be obtained as:
  • the frequency range [f_low_b, f_up_b] of the electronic device is determined according to the above formulas (3) and (4), where f_ultrspnic_b is the transmission frequency of the ultrasonic transmitter, and v max is the maximum relative speed that can be identified .
  • the frequency range of the electronic device is determined according to the frequency range and the audio sampling rate of the electronic device.
  • the frequency range of the electronic device is determined by combining the above formulas (3) and (4) and the following formula.
  • the formula is a set of audio data x containing fftlen discrete data points, and the amplitude-frequency vector X is obtained through discrete Fourier transform (DFT).
  • DFT discrete Fourier transform
  • fs is the sampling rate
  • X[n] represents the intensity of the frequency fn
  • ceil represents rounding up.
  • the determined frequency range of the electronic equipment is:
  • the frequency range of the electronic device can be determined, where the frequency range of the electronic device is [point_low_b, point_up_b], ceil represents rounding up, and fftlen represents the standard ultrasonic detection
  • the data length of the discrete Fourier transform of the device is [point_low_b, point_up_b], ceil represents rounding up, and fftlen represents the standard ultrasonic detection.
  • S740 Calibrate the first amplitude-frequency data according to the frequency range of the electronic device, the reference emission frequency response, and the frequency response at the ultrasonic emission frequency of the electronic device to obtain calibration amplitude-frequency data.
  • the first amplitude frequency data needs to be calibrated , That is, the first amplitude-frequency data is calibrated according to the reference transmitting frequency response of terminal A, the frequency range of the electronic device and the frequency response at the ultrasonic transmitting frequency of the electronic device, and the first amplitude-frequency data Calibration, specifically, the difference characteristic between the electronic device and the terminal A can be determined, and the first amplitude-frequency data is calibrated according to the difference characteristic, so that the calibration amplitude-frequency data obtained after the first amplitude-frequency data is calibrated can satisfy Requirements for using the above-mentioned ultrasonic analysis model on terminal A. For example, when acquiring the above-mentioned difference characteristic, the difference characteristic is a compensation value, and the compensation value is added to the first amplitude-frequency data to obtain the calibration amplitude
  • the first amplitude frequency data is calibrated according to the frequency range of the electronic device, the reference emission frequency response, and the frequency response at the ultrasonic emission frequency of the electronic device, that is, the steps of S740 include: S741 to S745.
  • part of the ultrasonic signal sent by the ultrasonic transmitter travels through the air directly to the ultrasonic receiver, and the other part travels through the air and reflects off the obstruction before reaching the ultrasonic receiver.
  • the ultrasonic receiver picks up the direct sound and the reflected sound.
  • the superimposed signal of A/D is converted into audio data.
  • S742 Cut the audio data according to the data length of the discrete Fourier transform of the standard ultrasonic detection device to obtain first amplitude frequency data.
  • the audio data of terminal B is divided into frames to obtain multiple frames of audio data, where the data length of each frame of audio data is fftlen, and then each frame of audio data is DFT transformed to obtain the first amplitude frequency data, which is the length of the DFT transformation For fftlen.
  • S743 Intercept the amplitude-frequency data located between the frequency range of the electronic device in the first amplitude-frequency data as the amplitude-frequency data to be calibrated.
  • amp_b [X[point_low_b] X[point_low_b+1]... X[point_up_b]]
  • the amplitude-frequency vector is an array composed of multiple amplitude-frequency data, and the amplitude-frequency vector is recorded as the amplitude-frequency data to be calibrated.
  • S745 Calibrate the amplitude-frequency data to be calibrated according to the calibration value to obtain calibration amplitude-frequency data.
  • calib amp_ulrtasonic_a-amp_ulrtasonic_b
  • amp_ultrspnic_a is the reference transmission frequency response
  • amp_ultrspnic_b is the frequency response at the ultrasonic transmission frequency of the electronic device
  • amp_b[i] is the amplitude frequency data to be calibrated
  • amp_b_calib[i] is the calibration amplitude frequency data
  • calib is the above-mentioned calibration value.
  • S750 Determine an amplitude-frequency curve of the electronic device according to the calibration amplitude-frequency data, where the amplitude-frequency curve is distributed with multiple frequency points, and each frequency point corresponds to an amplitude.
  • the amplitude-frequency vector amp_b_calib of the calibrated electronic device is obtained, and then the amplitude-frequency vector amp_a of n_a points needs to be obtained from the amplitude-frequency vector amp_b_calib of n_b points.
  • a polynomial curve is set, the amplitude-frequency vector amp_b_calib is fitted with the polynomial curve, and then the amplitude-frequency vector amp_a of n_a points is obtained by interpolation from the polynomial curve, thereby completing the mapping from amp_b_calib to amp_a, As shown in Figure 10.
  • the polynomial coefficients a, b, c, and d can be calculated by the amplitude-frequency vector amp_b_calib using the least square method.
  • methods such as interpolation and polishing can also be used.
  • the interpolation method estimates the approximate value of the function at other points through the value of the function at a finite number of points.
  • different interpolation formulas are selected to meet the actual calculation requirements, such as the three-bending moment method and the three-angle method.
  • the polishing method is a data fitting method that meets the requirements of convexity preservation. Integral can change the smoothness of a function, and differentiation is the inverse operation of integration. The function is integrated and then differentiated to restore the function. The difference is approximate to differentiation. After the function is integrated, the difference can be performed to restore the function approximately. This transformation is polishing. Which method to use can be set according to actual needs.
  • each amplitude-frequency vector of the electronic device is located or approximately on the curve, and the curve can be used as the amplitude-frequency curve of the electronic device.
  • S760 Determine the target frequency point corresponding to each sampling frequency point of the standard ultrasonic detection device in the amplitude-frequency curve of the electronic device and the amplitude value corresponding to the target frequency point.
  • the target frequency point corresponding to point_a in the amplitude-frequency curve of the electronic device can be obtained by linear interpolation. Specifically, each sample of the standard ultrasonic detection device is determined according to the following formula The target frequency point corresponding to the frequency point in the amplitude-frequency curve of the electronic device:
  • [point_low_b, point_up_b] is the frequency range of the electronic equipment
  • point_a is the sampling frequency of the standard ultrasonic detection device
  • x_a is the target frequency corresponding to point_a in the amplitude-frequency curve of the electronic equipment.
  • S770 Determine the second amplitude-frequency data according to each target frequency point and the amplitude corresponding to the target frequency point.
  • the target frequency point corresponding to each sampling frequency point of the standard ultrasonic detection device in the amplitude-frequency curve of the electronic device and the corresponding amplitude value of the target frequency point are determined, so that each sampling frequency point can be determined.
  • Each target frequency point and the amplitude corresponding to each target frequency point, each target frequency point and the amplitude corresponding to the target frequency point are used as the second amplitude frequency data.
  • the second amplitude-frequency data is used as the mapped amplitude-frequency data of each sampling frequency point of the standard ultrasonic detection device and the first amplitude-frequency data of the electronic device, that is, the ultrasonic receiving device of the electronic device receives
  • Each frequency point in the second amplitude-frequency data corresponding to the ultrasonic signal and the number of frequency points corresponding to the frequency point can be determined in the amplitude-frequency data of the standard ultrasonic testing device to determine the corresponding frequency point and the corresponding amplitude That is, for each sampling frequency point of the standard ultrasonic detection device, the corresponding target frequency point and the corresponding amplitude can be found in the amplitude-frequency curve of the electronic device, that is, the two complete frequency point mapping.
  • S780 Use the second amplitude-frequency data as an input of the ultrasonic analysis model to obtain the motion state of the electronic device.
  • the judgment result of the motion state of the obstruction relative to the electronic device is obtained through the feature extraction algorithm and the classification model on the terminal A.
  • S790 Control the electronic device to perform corresponding operations according to the motion state.
  • the embodiment of the present application realizes the frequency spectrum mapping between terminals of different models, and the feature extraction algorithm and classification model in terminal A can be applied to terminal B. Compared with the existing solution, the need for repetition in terminal B is eliminated. Performing feature extraction algorithm debugging and model training can greatly save manpower and time, and at the same time ensure the consistency of the recognition effects of different models of terminals.
  • FIG. 12 shows a structural block diagram of an ultrasonic processing apparatus 1200 provided by an embodiment of the present application.
  • the apparatus may include: a receiving unit 1210, an acquiring unit 1220, a mapping unit 1230, a detecting unit 1240, and a processing unit 1250.
  • the receiving unit 1210 is configured to send an ultrasonic signal through the ultrasonic transmitting device, and receive an ultrasonic signal returned by the ultrasonic signal after encountering an object through the ultrasonic receiving device.
  • the acquiring unit 1220 is configured to acquire the ultrasonic signal received by the ultrasonic receiving device, and obtain the first amplitude frequency data of the ultrasonic signal.
  • the mapping unit 1230 is configured to map the first amplitude-frequency data to the second amplitude-frequency data according to the parameters of the ultrasonic analysis model.
  • the mapping unit 1230 includes: a frequency point determining subunit 1231, a calibration subunit 1232, a fitting subunit 12303, a frequency point mapping subunit 1234, and an amplitude frequency determining subunit 1235.
  • the frequency point determination subunit 1231 is configured to obtain the frequency point range of the electronic device according to the maximum recognizable relative speed, wherein the frequency point range of the electronic device is considered when the electronic device processes the ultrasonic signal Frequency range.
  • the frequency point determining subunit 1231 is also used to obtain the transmission frequency of the ultrasonic transmission device; obtain the frequency range of the electronic device according to the transmission frequency of the ultrasonic transmission device and the maximum recognizable relative speed,
  • the frequency range of the electronic device is the frequency range considered when the electronic device processes the ultrasonic signal; the frequency range of the electronic device is determined according to the frequency range and the audio sampling rate of the electronic device.
  • the frequency range of the electronic device is determined according to the following formula:
  • the frequency range of the electronic device is [f_low_b, f_up_b], f_ultrspnic_b is the transmission frequency of the ultrasonic transmission device, and v max is the maximum relative speed that can be identified;
  • the frequency range of the electronic device is [point_low_b, point_up_b], ceil represents rounding up, and fftlen represents the data length of the discrete Fourier transform of the standard ultrasonic detection device.
  • the calibration subunit 1232 is configured to calibrate the first amplitude frequency data according to the frequency range of the electronic device, the reference emission frequency response, and the frequency response at the ultrasonic emission frequency of the electronic device to obtain the calibration amplitude Frequency data.
  • the calibration subunit 1232 is also used to obtain the audio data of the ultrasonic signal; intercept the audio data according to the data length of the discrete Fourier transform of the standard ultrasonic detection device to obtain the first amplitude frequency data; In the first amplitude-frequency data, the amplitude-frequency data located between the frequency range of the electronic device is used as the amplitude-frequency data to be calibrated; the reference transmission frequency response and the ultrasonic transmission frequency of the electronic device are obtained The difference between the frequency responses is used as a calibration value; the amplitude-frequency data to be calibrated is calibrated according to the calibration value to obtain the calibration amplitude-frequency data.
  • calib amp_ulrtasonic_a-amp_ulrtasonic_b
  • amp_ultrspnic_a is the reference transmission frequency response
  • amp_ultrspnic_b is the frequency response at the ultrasonic transmission frequency of the electronic device
  • amp_b[i] is the amplitude frequency data to be calibrated
  • amp_b_calib[i] is the calibration amplitude frequency data .
  • the fitting subunit 1233 is configured to determine the amplitude-frequency curve of the electronic device according to the calibration amplitude-frequency data, the amplitude-frequency curve is distributed with multiple frequency points, and each frequency point corresponds to an amplitude value.
  • the frequency point mapping subunit 1234 is used to determine the target frequency point corresponding to each sampling frequency point of the standard ultrasonic detection device in the amplitude-frequency curve of the electronic device and the amplitude value corresponding to the target frequency point.
  • the target frequency point corresponding to each sampling frequency point of the standard ultrasonic detection device in the amplitude-frequency curve of the electronic device is determined according to the following formula:
  • [point_low_b, point_up_b] is the frequency range of the electronic equipment
  • point_a is the sampling frequency of the standard ultrasonic detection device
  • x_a is the target frequency corresponding to point_a in the amplitude-frequency curve of the electronic equipment.
  • the amplitude-frequency determining subunit 1235 is configured to determine the second amplitude-frequency data according to each target frequency point and the amplitude corresponding to the target frequency point.
  • the detection unit 1240 is configured to use the second amplitude-frequency data as an input of the ultrasonic analysis model to obtain the motion state of the electronic device.
  • the processing unit 1250 is configured to control the electronic device to perform corresponding operations according to the motion state.
  • processing unit 1250 is further configured to control the display screen to be in the on-screen state or the off-screen state according to the motion state.
  • the coupling between the modules may be electrical, mechanical or other forms of coupling.
  • each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module.
  • the above-mentioned integrated modules can be implemented in the form of hardware or software functional modules.
  • the electronic device 100 may be an electronic device capable of running application programs, such as a smart phone, a tablet computer, or an e-book.
  • the electronic device 100 in this application may include one or more of the following components: a processor 110, a memory 120, a display screen 130, an ultrasonic transmitter 140, an ultrasonic receiver 150, and one or more application programs, of which one or more applications
  • the program may be stored in the memory 120 and configured to be executed by one or more processors 110, and the one or more programs are configured to execute the methods described in the foregoing method embodiments.
  • the processor 110 may include one or more processing cores.
  • the processor 110 uses various interfaces and lines to connect various parts of the entire electronic device 100, and executes by running or executing instructions, programs, code sets, or instruction sets stored in the memory 120, and calling data stored in the memory 120.
  • Various functions and processing data of the electronic device 100 may use at least one of digital signal processing (Digital Signal Processing, DSP), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA), and Programmable Logic Array (Programmable Logic Array, PLA).
  • DSP Digital Signal Processing
  • FPGA Field-Programmable Gate Array
  • PLA Programmable Logic Array
  • the processor 110 may integrate one or a combination of a central processing unit (CPU), a graphics processing unit (GPU), and a modem.
  • the CPU mainly processes the operating system, user interface, and application programs; the GPU is used for rendering and drawing of display content; the modem is used for processing wireless communication. It can be understood that the above-mentioned modem may not be integrated into the processor 110, but may be implemented by a communication chip alone.
  • the memory 120 may include random access memory (RAM) or read-only memory (Read-Only Memory).
  • the memory 120 may be used to store instructions, programs, codes, code sets or instruction sets.
  • the memory 120 may include a program storage area and a data storage area, where the program storage area may store instructions for implementing the operating system and instructions for implementing at least one function (such as touch function, sound playback function, image playback function, etc.) , Instructions for implementing the following method embodiments, etc.
  • the data storage area can also store data (such as phone book, audio and video data, chat record data) created by the terminal 100 during use.
  • the display screen 130 is used to display information input by the user, information provided to the user, and various graphical user interfaces of the electronic device 100. These graphical user interfaces can be composed of graphics, text, icons, numbers, videos, and any combination thereof.
  • the display screen 130 may be a liquid crystal display (LCD) or an organic light-emitting diode (OLED), which is not limited here.
  • FIG. 15 shows a structural block diagram of a computer-readable storage medium provided by an embodiment of the present application.
  • the computer-readable medium 1500 stores program code, and the program code can be invoked by a processor to execute the method described in the foregoing method embodiment.
  • the computer-readable storage medium 1500 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), EPROM, hard disk, or ROM.
  • the computer-readable storage medium 1500 includes a non-transitory computer-readable storage medium.
  • the computer-readable storage medium 1500 has a storage space for the program code 1510 for executing any method steps in the above methods. These program codes can be read out from or written into one or more computer program products.
  • the program code 1510 may be compressed in an appropriate form, for example.
  • the method provided by the present application sends an ultrasonic signal through the ultrasonic transmitter, and receives the ultrasonic signal returned by the ultrasonic signal after encountering an object through the ultrasonic receiver, and then, after obtaining the electronic equipment to receive
  • the amplitude-frequency data of the ultrasonic signal is not used to obtain the motion state of the electronic device, but according to the parameters of the ultrasonic analysis model, the first amplitude-frequency data is mapped to the second amplitude-frequency data, and then .
  • the electronic device uniformly uses the ultrasonic analysis model and the mapped second amplitude-frequency data to determine the motion state of the electronic device,
  • the different hardware facilities of electronic equipment lead to different parameters for collecting ultrasonic signals. Due to the use of a unified ultrasonic analysis model and a unified mapping relationship, the difference in ultrasonic analysis effects of different devices can be reduced.
  • the embodiment of this application implements frequency spectrum mapping between terminals of different models, and the feature extraction algorithm and classification model in terminal A can be applied to terminal B, compared to
  • the existing solution eliminates the need to perform feature extraction algorithm debugging and model training again in terminal B, which can greatly save manpower and time, and at the same time ensure the consistency of recognition effects of different models of terminals.

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

L'invention concerne un procédé et un appareil de traitement par ultrasons, un dispositif électronique et un support lisible par ordinateur se rapportant au domaine technique des terminaux mobiles. Le procédé consiste : à envoyer un signal ultrasonore au moyen d'un appareil d'émission d'ultrasons, et à recevoir au moyen d'un appareil de réception d'ultrasons un signal ultrasonore renvoyé après que le signal ultrasonore a rencontré un objet (S301) ; à acquérir le signal ultrasonore reçu par l'appareil de réception d'ultrasons afin d'obtenir des premières données de fréquence-amplitude du signal ultrasonore (S302) ; à mettre en correspondance les premières données de fréquence-amplitude avec des secondes données de fréquence-amplitude en fonction des paramètres d'un modèle d'analyse d'ultrasons (S303) ; à utiliser les secondes données de fréquence-amplitude en tant qu'entrée du modèle d'analyse d'ultrasons de façon à obtenir l'état de déplacement d'un dispositif électronique (S304) ; et à commander au dispositif électronique d'effectuer une opération correspondante en fonction de l'état de déplacement (S305). Ainsi, le dispositif électronique utilise uniformément le modèle d'analyse d'ultrasons et les secondes données de fréquence-amplitude mises en correspondance pour déterminer l'état de déplacement du dispositif électronique, ce qui peut réduire la différence d'effets d'analyse d'ultrasons de différents dispositifs.
PCT/CN2020/103323 2019-07-31 2020-07-21 Procédé et appareil de traitement par ultrasons, dispositif électronique et support lisible par ordinateur WO2021017950A1 (fr)

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